cisco-sa-FTD-snort3-DOS-Aq38LVdM: Cisco Firepower Threat Defense Software DNS Enforcement Denial of Service Vulnerability
First published: Wed Apr 27 2022(Updated: )
A vulnerability in the Snort rule evaluation function of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of the DNS reputation enforcement rule. An attacker could exploit this vulnerability by sending crafted UDP packets through an affected device to force a buildup of UDP connections. A successful exploit could allow the attacker to cause traffic that is going through the affected device to be dropped, resulting in a DoS condition. Note: This vulnerability only affects Cisco FTD devices that are running Snort 3. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-FTD-snort3-DOS-Aq38LVdM This advisory is part of the April 2022 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see Cisco Event Response: April 2022 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.
Credit: This vulnerability was found during the resolution a Cisco TAC support case
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco FTD Software | >=6.7.0<=7.0.0<7.0.2 (May 2022) | 7.0.2 (May 2022) |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for this Cisco Firepower Threat Defense Software vulnerability?
The vulnerability ID for this Cisco Firepower Threat Defense Software vulnerability is cisco-sa-FTD-snort3-DOS-Aq38LVdM.
What is the severity of the Cisco Firepower Threat Defense Software DNS Enforcement Denial of Service Vulnerability?
The severity of the Cisco Firepower Threat Defense Software DNS Enforcement Denial of Service Vulnerability is high, with a severity value of 8.6.
How does this vulnerability in the Snort rule evaluation function affect Cisco Firepower Threat Defense (FTD) Software?
This vulnerability could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
What is the affected software for this vulnerability?
The affected software for this vulnerability is Cisco Firepower Threat Defense (FTD) Software, versions 6.7.0 up to 7.0.0, and 7.0.2 (May 2022).
How can I fix the Cisco Firepower Threat Defense Software DNS Enforcement Denial of Service Vulnerability?
To fix this vulnerability, you should upgrade to Cisco Firepower Threat Defense (FTD) Software version 7.0.2 (May 2022) or apply any recommended remedies provided by Cisco.
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